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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2b2c72ed9e4b86047d733f6e4593a5f6eb3ac555c79b7e1a91b2a7b266f7d1' 
  AND token = '5Tg5HkZztC3p/t+t/zt3N0iSV/PhQmHH3KNnlaDrw5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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