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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d842e4f2b04c5f8f5c1512a374971c21dc4d9ed0a7606137e530ff28ea5f6b' 
  AND token = '2t7THf7XLUt82eg7dj8aI02ihV37ojZXyomgPo4sXGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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