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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52804e7ef4de7ec0831940d4595e43721903e22f69cfa3aeb338f319a628808d' 
  AND token = 'ZC8Eax9Zpd5BitYxTHXIgT1h0fA136LyzQHvgmbVK3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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