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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fc92d6e6fc856132469b84414a71ad79a7a799d34e62423e357e77826f23fd' 
  AND token = '5GYMcMRzPlXc35BpJNfRu7w2l5GrN5XpphKXz6SztlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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