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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8af7697e808a73885f6fea229b9d5b375ab7a4d18b98e1d3555bcfc24f892c8' 
  AND token = '3w/jObf3d4abohuplfcttafztD3HEWPRnwHfRWRpAkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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