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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347ea1daa1ff91d1cc02de9fdf386bcb2597d0168d954fcb86c9cb75c6a7a86a' 
  AND token = 'RfMW+kOFxFESj7IvXqixmLmqxzqIgPvM+5D3gCPag9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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