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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25cb0e5fde1c6ca9e6d9e9bfa6503107b3d916ae653f651c6c03364d411f6ab' 
  AND token = 'FZdBFSKvCbF8zD42y9xgtZ9HBmeOePaKzbte/kLM4bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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