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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdd3e8ba8d584baf66c2ca71354b41f8f78b0d1c69a6b47bd6a08e5f75258d9' 
  AND token = 'JARwd2Uz42V7ck+r6t63n25wO6RRfgKDKhEBk0xQ6zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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