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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d0c7c6556ae85568bc54d2f4c4bc2b3d4475d6474a47ee34001c7b57f6fce7' 
  AND token = '5gDk1Erz0nHFJVDUivrdrOxiCG4tWwwH7+iOqIdpR/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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