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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f7861d836385c29429a182894bfda55a6a663d782a84a23628901fd10c4e7e' 
  AND token = 'V0DHhK+ppESpEWoqXqVFIeYjPE5Y4EEcWOw7WB4dzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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