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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b605071731c830be06f644d7d19393c47601a7e5dfc68c377d9410175a81e2e2' 
  AND token = '+QqnU1JyfXD2nVDuesieK/hq03++FugTRxITFp3WtP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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