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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce8e8a069b251991ada73dccbb6b2efbef7e0dd6b344198213547302b62940a' 
  AND token = 'PMxVbUH6o+J9Byyd9m09ZBauFy4gjWtZPaqszQt3nrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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