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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2939d4c46235761a785bb7deeb8704ecc5a76ab820f7b4d30e909dccf4e97d3a' 
  AND token = 'lFwSwTP4XdT/G9+5pRgVZWwhOb6/IEUm5Da9++v3kmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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