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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eac75dcfb44dfb5cf303bee660cb49c480c8d2cda6ac505ffdd933730eb428d' 
  AND token = 'd9sU3hpXV6Usn8+1hbbp0UrRiEDbBjL5ShANUxjnGhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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