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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62590529ebfaa4dae6ffdc6e5397105d06c1eba0848f9c9bb8d2616746d4373' 
  AND token = 'InMKMZSPCoc8YoxQUuT/TN1G+Yot8u4hr7nkUctbwVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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