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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050a2821a003c64680ab6a04df3e7571833f82cbb5881c87603d674dd8cc6418' 
  AND token = 'wqX9xo9jc+exor/iJJnOYMaq/SJA/dkXB7QHFA1KKtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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