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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a93829699c337ba60f2ce7b0632f29f60f58b7c3dd1099f4c6050bd118cebb4' 
  AND token = '4XJt+DXquzoXayiFqpNC/hF6THlsbnBvnQo7cb5knoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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