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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5526f14eca1eb037cf397f6290f8985ac4b4ec10972603556a405f31b4e7df9' 
  AND token = 'iUmQYW8UvOp214tvx3a6acKJp/xWWydJ5IRf+6T82ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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