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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130b8ccdb5b9974e436ca725de3a8d940b2523724b26b11ae8fdec266d92c3b4' 
  AND token = '/j8trvLTh4oUFRmjZ2R+mow6iFaslibGR+4jVxx0LMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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