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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f802d785d307bd9aa16fe14d48370efd85ff535f1d374ecce8ae0f2b3d2e408a' 
  AND token = '7VF79laqJ8Y291Ti6VAoW8zN4YKDUhcz+NBvLumhufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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