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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab4c56e62a78c06d89056f29c3c0ccec7ee081eb88fb0c42e8f735dcca5df1a' 
  AND token = 'yhBEOloMK25x5FgbHrFhz8GlhZDmPiSvvD9Uoc8Aaus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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