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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bcb1724f48c16f7842def902842635d4eaa4d2b04d8eff1d276cd5af62f052' 
  AND token = '6S9DhShwO5dAoBjXJXx46Bjg8wh3m+l6e5cHDedsVvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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