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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ea9e5b1fa2e447beef7a20a4aefbb7d5c64d7777ed9f9ad52f7bd5d48dc5ef' 
  AND token = 'l9Olf+ECVvTeZFCQHAma1Dymht/jQ7krMJcu5yZA9ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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