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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5bd706b741a4f60413c1af3df2706b3b30fa5575c144237509b2d849bebbce' 
  AND token = '+rJN2LLYehB3OUkJDJKiFa7H8BNyBCR4lYEyh0VTyQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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