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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4de3b0bf3569fd18e51665df9b1382e19884103c72638d8ad505931b20e9db3' 
  AND token = 'i3HtjWYb9UcJe2dD4i5S4y9EKILCI4So0ZIMUqLKgSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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