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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da79fa04a3942ce79472f4e6c06b1bec9af23e287fe2b09851df8cfb90312fb7' 
  AND token = 'CVaQiPkdarsh+2RBgOSYbM8boUoJDajx1KcvUfX7TJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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