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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f01db072ea527db8f54c11b481eefdc5b9bb7d4f8f39e32e20f75603f60e85' 
  AND token = 'bM1AZS40geBXzDh2hogHUnVfJ6yaYY8J6yA/uTzYJds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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