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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968fca8d16fe126692703ff4f733209120f7bf710913e2fa73623d0ad8e08063' 
  AND token = 'felqYCyDY7BW5nOkE2qpvtYVxZJ8hXcICSO6HK/j7eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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