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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b1a7b0ab703a3b41cd9706882af0e08285742da5f78bc6a1bc6dabf14b76d7' 
  AND token = 'Re6aXJsKwLUU77rf2c74ew3tyOnmVz8ThQt7DQdegWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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