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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201d0317b195b6b15d1dea5087b74acf98573d0c0bc3d3ffc1f01730dcd54a4c' 
  AND token = 'M/1YVBMxvB9poytbJAS/PbrpI3IYU7lp25udbjdSTbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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