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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c874e3c6c08583303ab370a9548e5d77d97afc2d83873b32355299003a188e' 
  AND token = 'DOrYvKxSHfkIMnGF0nTak6cByAvntt2l/AApThE01WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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