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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e17768e69d2ca0e5212a298459d6801568f8ec9eae7dccf54ca089594e1c9ac' 
  AND token = 'I/7sAJ6CdUni0mkEOEi3I8zvMUreR7V3Hh7OLBMdET4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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