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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ba43210dfbfb7d03da1f4ff713d9638c6cb1074357228e70b1b6e527a4d65a' 
  AND token = 'dy8roElrtCKofxejcfC6UTGLu6BAFF7FVin+yiHmC0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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