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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08e61d4a57e61c5fff8238c4328d6bea9d2faba260ff13dd5c6cff3415bcf83' 
  AND token = 'WEnCGbznkmEwUSvMFLavm7nOPWMzI30iq/MCnBiZrBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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