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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb9d87c7c74924d8921d96af90ffffaca5e8dfdb240dd045064dc58beb072d5' 
  AND token = 'ne9ADA6jkqqTmOD1Keksk9+0tZz1vjc+CGExGTY/Hvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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