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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddeee625e2ff7d9bbdfaa980539e99f0e4689a80d0f68baf53eb2ff2f3e11844' 
  AND token = 'rYcs5CmeRPymUDkBpHYDNhsAsXawIgrLs9PbGv6sz+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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