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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2ba3bd0e4134be8ff2a8844f8d10aebc75b945c5ff9d3c46564d17f897d906' 
  AND token = 'V28lX7fhdHjzxIzOjTIWqHzcRoiZrmP/hI3AX0pLry8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}