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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f9188b416ff981c4c356acd35e521bd959dd5038c03d721e2930f61ea94ecf' 
  AND token = 'r1jNwIlwo72iy8wFL2oyVEyVne2Og6MqAn2q3WzL1dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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