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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e20d65de35f0c635316fd67e63ed6ac1ec0b78514f5c3c575a8bd06148ef51' 
  AND token = 'TBfMA9ny3ElJOd1QnpCDmvCdUWX1GQBfGpQ4kT1PONY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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