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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe694e8401ccbcfa4bde9021db19329dbb2dccf31be5572a34fa84796328fc9b' 
  AND token = 'izqxFGSpSzehmSBB3AooJWfVZq0F0Yj1bulsnfJ8etk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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