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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee38a6285b421fafdab2e101354e95a981829db19f5fdec4f72d1f0091863c3' 
  AND token = 'ArnpsqiTxznpraYGZn3mkGjb0jlv53bIvpC2RsDiWWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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