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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028c4d1c51d12a4e1e9eaead7b293531084b2f39dcdf767df9d7901770ff4963' 
  AND token = 'ab9HYtD2tL95fXE88t/jn0StEC6B6gJnlaTZFuav2Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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