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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e275ccbf344f5a1adf1159d7ae3fc56f78e0665adc15b6fcc8378910edacb7' 
  AND token = 'k9+U9rHixamzBLAXsPASGnmRjc7qt0anjxYioSn1tSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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