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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b5f6702afccb6ae12e3d54ef3339f15757a0528509020f34c0310c5ab154ab' 
  AND token = 'dZZuw07gdK0EAmhH8Dgh8uJZenxbmqBu5y0d/5cVy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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