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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc8bf765ea8f27dcd6e4e06f5bfefed1ad7c965a0f76e4fc396ee82b5e8a3d2' 
  AND token = 'cQQ5sT/MXjEWJGVYMwAJBrmLsN645tSe8dEv7RVoWMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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