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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a698ca2ffc2035c8c676014541f455efd2841cb0a91768094c4c95e989f297' 
  AND token = 'm0rTvKsP/r5zm6VwmYPx8LBQW1DKbv+HSc/DesaxR84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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