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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1dab07e4b5b696be5e397d03f5a4f6f10ab8ec67ff796d9167de12c96a756e' 
  AND token = '1QFW1nGrsKJJISxsvJp02wUBUJSoLmKTWmaBGu1I5eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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