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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433acec39b0a922a03b4282295435f0c9f15a1f4cf119429ef4fe81bd2373ce3' 
  AND token = '2g09CuQxE1fA4MgsHCsSGT2Ztt9SEvafcdvhXqmabLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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