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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94936604845af5aaad96e5495cf9748bf109abcee6bcf159f63876262beaffea' 
  AND token = 'lekzOr3aFnSypKc9Y+hGn3Ms9uu7Nw9aSDqQOdrN2XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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