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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1d022b865a280a2e2e54daaed9bc21abad84a8c85d69462bfc8506e9a01be5' 
  AND token = 'bvn7niroDqbG8gdWx2rZmkk+vRsDMlOM/0aomj0v+4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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