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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0971adcd997f81f49c582c3868bf6578bca553edfe8a0ac128830b1ca3215462' 
  AND token = 'GCWw3ReTlzV0e5WyrNkOrO6veItNP2l1EARpxX0ijpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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