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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8528936ad9b389ca693a0cadd17c4c778459a3170814633f88eab0e7b631d70c' 
  AND token = 'cvkCFZHtWOmCU8ykj0fpVcCFhLt+8JLskY+2lmA3bgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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