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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebe84fc5947f40810528cf81034b74d88cffaa6f690454484f331fd66b269a8' 
  AND token = 'x+TlYNs5MIEi+p+K8wPCdX9TQxlkAyc4UMg+woBz814=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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