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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40e84b6c0fa66aa92599922820cc38e38266e393b3246b629dcee6c81c547ce' 
  AND token = '9/dL0bjKi4FWbIzmmaw2LNIZd+MIVoWPyZPC79kaAMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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