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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e69b61d3cc891b74249c376bfd9eabaeb184724e50d0e3adec4a8c516fe0008' 
  AND token = 'qVwhseOd0NgLAvjlBuhnfEH8gNECFsqPvwrNVmuDcU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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