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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c53d5e036c1d5239e4f65f6e6bc60eeaaf3f4d565f87b9cd0dbf99bd21bf6f' 
  AND token = '2p1BtkfAN5PWrAQeYUK61PfIEfBw9vDKsPQAgfaLrcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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