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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153e53278950748216d95d3cf6d099ec1b9eae7a956223bfec8cf61b7592b25d' 
  AND token = '2BfuDijB5tEaW+EMe05goQ7f+h93StIsNrj6hNGx0Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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