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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe226ff1a0903575147dc7e98dcf4eae14d2caf5f7a26f1ccaa3f838df48a960' 
  AND token = 'NKz4wragrLh0eueMGc8EbU53mlDoNwPc8FzXXELG9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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