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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd728cb1b1a830e67706b18bdba355e28faed7c4eed578731070afe44b15a0e' 
  AND token = '3YD6PiQugGBG5auDnZBO1RnL/tFjle/NGFVoZBgl038=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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