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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ccc817a79b23417dd075f498c580d33017d8923a9ce1fb5bf5d7358d173d7b' 
  AND token = 'Vf3biAtOykk5vv+imcHCIAHFlMXGZ5xNOMNr9GaAMgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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