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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6ea5e636e3202effc55edb63c94b380057a16a4b5989ae1f6c813daa1f082d' 
  AND token = 'jCFtlmHp/JXmmdbW8E3nKcjQA7JZD2E9+SL+bZ+Q+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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