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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526e8c7d615b6758c067ac054f3de7d034da1a9c5601b522063558117b474ddb' 
  AND token = 'ysyQpvWqaVQNW7OAltLCGpXlasFJycmzL2Cih/qhk10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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