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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fd685d1d2f1a0ed0e4985fc49a6af8addc5da2a9e973fbb1617ab69dc9703c' 
  AND token = 'IRVsdvmb7H01o1olWqUGVjtHlnECyd4pCwf93aNmqSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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