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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdbe4cbcbd1ae68d25915d56ba7ed5ca904aa9487644333b1783bd3455b6b44' 
  AND token = 'B2fnA8FDShPvcKfCsbJOLJLuv/hqE7xX5QuyfRuDPNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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