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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e2439f83f2f55e86511af364e512bc647d56c0ca950f81c9034da3633ec8eb' 
  AND token = 'IiNt6fiFTygsx/6CeKzFTIiN1fY4KBJCGO72dreTg30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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