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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7087b20f705f6c6c470688bb6f95635a03541016e9ceba67321a2396faf70773' 
  AND token = 'K/vvIyhrAHciz/MNwZ0vGsxdAaXxx/wc9BVMF8obdFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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